LM324ADRG4 Equivalent & Substitute Parts

Part Overview

The LM324ADRG4 is a general-purpose operational amplifier integrated circuit manufactured by Texas Instruments, configured as a 4-circuit device in 14-SOIC surface mount packaging. This part is classified as Last Time Buy, indicating discontinued production with limited remaining inventory of 2200 pieces. The LM324ADRG4 operates across a supply voltage range of 3V to 30V and is suitable for general-purpose amplification applications requiring moderate bandwidth and low input bias current characteristics.

Equivalent and substitute parts are necessary due to the Last Time Buy status of the LM324ADRG4. Alternative devices with compatible electrical and mechanical specifications ensure design continuity and long-term component availability for production and maintenance applications.

Key Parameters

Parameter	LM324ADRG4 Value	Unit	Substitution Relevance
Amplifier Type	General Purpose	—	Critical
Number of Circuits	4	Channels	Critical
Gain Bandwidth Product	1.2	MHz	Critical
Slew Rate	0.5	V/µs	Important
Current - Input Bias	15	nA	Important
Voltage - Input Offset	2	mV	Important
Current - Supply	1.4	mA (x4 Channels)	Important
Current - Output / Channel	30	mA	Important
Voltage - Supply Span (Min)	3	V	Critical
Voltage - Supply Span (Max)	30	V	Critical
Operating Temperature	0 to 70	°C	Important
Package / Case	14-SOIC (0.154", 3.90mm Width)	—	Critical
Mounting Type	Surface Mount	—	Critical
RoHS Status	ROHS3 Compliant	—	Critical

Substitute Part Grouping Explanation

Substitution of the LM324ADRG4 is determined by strict alignment of electrical and mechanical parameters. The following criteria establish valid substitute relationships:

Critical Substitution Parameters:

Four-circuit operational amplifier configuration
14-SOIC surface mount package with 0.154" (3.90mm) width
Supply voltage range minimum of 3V and maximum of 30V or greater
General-purpose amplifier classification
ROHS3 compliance and MSL Level 1 rating

Important Electrical Parameters:

Gain bandwidth product within 1.0 MHz to 1.2 MHz range
Slew rate of 0.2V/µs or greater
Input bias current of 45 nA or less
Input offset voltage of 2 mV or less
Output current per channel of 30 mA or greater
Supply current compatible with application requirements

Substitute parts are grouped into two categories: direct pin-compatible replacements from Texas Instruments (LM324 series variants) and functionally equivalent devices from alternative manufacturers (UMW, Rohm Semiconductor) that meet all critical and important electrical parameters within specified tolerances.

Parameter Comparison

Part Number	Manufacturer	GBW (MHz)	Slew Rate (V/µs)	Input Bias (nA)	Input Offset (mV)	Supply Current (mA)	Output Current (mA)	Vcc Min (V)	Vcc Max (V)	Temp Range (°C)	Package	Status
LM324ADRG4	Texas Instruments	1.2	0.5	15	2	1.4	30	3	30	0 to 70	14-SOIC	Last Time Buy
LM324ADR	UMW	—	—	20	2	1.1	30	—	30	-30 to 85	14-SOIC	Active
LM2902DR	Rohm Semiconductor	1.2	0.3	20	1	1	30	3	32	-40 to 125	14-SOIC	Obsolete
LM324AM/NOPB	Texas Instruments	1	—	45	2	1.5	40	3	32	0 to 70	14-SOIC	Active
LM324AMX/NOPB	Texas Instruments	1	—	45	2	1.5	40	3	32	0 to 70	14-SOIC	Active
LM324M/NOPB	Texas Instruments	1	—	45	2	1.5	40	3	32	0 to 70	14-SOIC	Active
LM324MX/NOPB	Texas Instruments	1	—	45	2	1.5	40	3	32	0 to 70	14-SOIC	Active
LP324M/NOPB	Texas Instruments	0.1	0.05	2	2	0.085	10	3	32	0 to 70	14-SOIC	Active
LP324MX/NOPB	Texas Instruments	0.1	0.05	2	2	0.085	10	3	32	0 to 70	14-SOIC	Active
BA10324AF-E2	Rohm Semiconductor	0.5	0.2	20	2	0.6	35	3	32	-40 to 85	14-SOIC	Active
BA2902F-E2	Rohm Semiconductor	0.5	0.2	20	2	0.7	30	3	32	-40 to 125	14-SOIC	Active

Engineering Selection Recommendations

Tier 1 - Direct Replacements (Texas Instruments LM324 Series):

The LM324AMX/NOPB, LM324AM/NOPB, LM324M/NOPB, and LM324MX/NOPB are pin-compatible direct replacements manufactured by Texas Instruments. These devices maintain the same base product number (LM324) and 14-SOIC package configuration. All are ROHS3 compliant with MSL Level 1 rating. The primary difference is reduced gain bandwidth product (1 MHz versus 1.2 MHz) and increased input bias current (45 nA versus 15 nA). These devices are suitable for applications where the lower bandwidth is acceptable. All four variants are in Active product status with substantial inventory availability (36,756 to 50,513 pieces).

Tier 2 - Functionally Equivalent Active Devices:

The LM324ADR (UMW) and BA10324AF-E2 (Rohm Semiconductor) are functionally equivalent alternatives in Active status. The LM324ADR provides extended operating temperature range (-30°C to 85°C) and reduced supply current (1.1 mA). The BA10324AF-E2 offers lower supply current (0.6 mA) and extended temperature range (-40°C to 85°C) with slightly reduced gain bandwidth product (0.5 MHz). Both maintain 30 mA or greater output current capability and 3V to 32V supply voltage range.

Tier 3 - Low-Power Alternatives:

The LP324M/NOPB and LP324MX/NOPB are low-power variants with significantly reduced supply current (85 µA) and output current (10 mA). These are suitable only for applications with reduced bandwidth requirements (100 kHz) and lower output drive capability. Selection requires verification that application specifications accommodate these reduced performance parameters.

Tier 4 - Obsolete Devices:

The LM2902DR (Rohm Semiconductor) and BA2902F-E2 (Rohm Semiconductor) are classified as Obsolete or Active respectively but represent alternative architectures. The LM2902DR is Obsolete status and should not be selected for new designs despite technical compatibility. The BA2902F-E2 is Active with extended temperature range (-40°C to 125°C) and represents a viable long-term alternative.

Compliance and Certification:

All recommended substitute parts maintain ROHS3 compliance and MSL Level 1 (Unlimited) moisture sensitivity rating, matching the original LM324ADRG4 specifications. REACH status is Unaffected for all alternatives. ECCN classification remains EAR99 and HTSUS code 8542.33.0001 across all substitutes.

Frequently Asked Questions (FAQ)

Q: Can LM324AMX/NOPB directly replace LM324ADRG4 in existing designs?

A: Yes. The LM324AMX/NOPB is pin-compatible with identical 14-SOIC package dimensions and pinout. Both are Texas Instruments products with ROHS3 compliance. The primary electrical difference is reduced gain bandwidth product (1 MHz versus 1.2 MHz). Applications operating below 1 MHz bandwidth requirements experience no functional difference. Applications requiring the full 1.2 MHz bandwidth must be evaluated for performance impact.

Q: What is the difference between LM324AMX/NOPB and LM324AM/NOPB?

A: Both devices are electrically identical with matching specifications. The primary difference is packaging format: LM324AMX/NOPB is supplied in Cut Tape & Digi-Reel format with 36,756 pieces in stock, while LM324AM/NOPB is supplied in Tube format with 105,684 pieces in stock. Selection depends on assembly process requirements and inventory availability.

Q: Why is the LM2902DR listed as Obsolete?

A: The LM2902DR is classified as Obsolete by Rohm Semiconductor, indicating discontinued production. Although 90,223 pieces remain in inventory, this status indicates no long-term availability guarantee. New designs should not incorporate this part. Existing designs using LM2902DR should transition to Active status alternatives such as BA2902F-E2 or Texas Instruments LM324 series variants.

Q: Can LP324M/NOPB replace LM324ADRG4?

A: No. The LP324M/NOPB is a low-power variant with fundamentally different electrical characteristics: 100 kHz gain bandwidth product (versus 1.2 MHz), 10 mA output current per channel (versus 30 mA), and 85 µA supply current (versus 1.4 mA). This device is suitable only for applications specifically designed for low-power operation with reduced bandwidth and output drive requirements. Direct substitution in existing LM324ADRG4 designs will result in functional failure.

Q: What is the significance of the extended temperature range in BA2902F-E2?

A: The BA2902F-E2 operates across -40°C to 125°C, compared to LM324ADRG4 range of 0°C to 70°C. Extended temperature range is relevant only for applications requiring operation outside the standard 0°C to 70°C specification. For standard industrial applications operating within 0°C to 70°C, the extended range provides no functional advantage but may incur cost premium. Selection should be based on actual application temperature requirements.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed maintain ROHS3 compliance and MSL Level 1 (Unlimited) moisture sensitivity rating, matching the original LM324ADRG4. REACH status is Unaffected for all alternatives. These certifications ensure regulatory compliance for applications subject to environmental and hazardous substance restrictions.

Q: What is the difference between 14-SOIC and 14-SOP package designations?

A: 14-SOIC and 14-SOP are functionally equivalent surface mount packages with identical pinout and electrical characteristics. The designations reflect different manufacturer naming conventions. The LM324ADR uses 14-SOP designation while LM324ADRG4 uses 14-SOIC, but both are physically and electrically compatible 14-pin small-outline packages with 0.154" to 0.173" width specifications. PCB footprints are interchangeable.

Q: Which substitute offers the best long-term availability?

A: The LM324AMX/NOPB and LM324MX/NOPB (Texas Instruments) offer the strongest long-term availability due to Active product status, established supply chain, and high inventory levels (36,756 to 50,513 pieces). Texas Instruments maintains these as core product offerings in the LM324 family. Alternative manufacturers (UMW, Rohm Semiconductor) provide viable options but with lower inventory visibility and potentially longer lead times.

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